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[lldb] Fix libstdc++ 11's std::unique_ptr affecting LLDB testsuite TestDataFormatterStdUniquePtr.py

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libstdc++ since version 11 has a conditional compilation based on
[[no_unique_address]] availability whether one element is either
inherited or put there as a field with [[no_unique_address]].

The code comment is by teemperor.

Reviewed By: teemperor

Differential Revision: https://reviews.llvm.org/D104283
This commit is contained in:
Jan Kratochvil
2021-06-15 11:19:20 +02:00
parent 88da6c1ead
commit fffb975095
1 changed files with 11 additions and 3 deletions
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14
lldb/source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
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@@ -99,9 +99,17 @@ bool LibStdcppUniquePtrSyntheticFrontEnd::Update() {
if (ptr_obj)
m_ptr_obj = ptr_obj->Clone(ConstString("pointer")).get();
ValueObjectSP del_obj = tuple_frontend->GetChildAtIndex(1);
if (del_obj)
m_del_obj = del_obj->Clone(ConstString("deleter")).get();
// Add a 'deleter' child if there was a non-empty deleter type specified.
//
// The object might have size=1 in the TypeSystem but occupies no dedicated
// storage due to no_unique_address, so infer the actual size from the total
// size of the unique_ptr class. If sizeof(unique_ptr) == sizeof(void*) then
// the deleter is empty and should be hidden.
if (tuple_sp->GetByteSize() > ptr_obj->GetByteSize()) {
ValueObjectSP del_obj = tuple_frontend->GetChildAtIndex(1);
if (del_obj)
m_del_obj = del_obj->Clone(ConstString("deleter")).get();
}
if (m_ptr_obj) {
Status error;